MYSQL multiple words search result - php

Question

When I type about three keywords or more it seems to only search the first keyword i.e bolt nut washer it will only search bolt.
I would like to search multiple keywords or the complete search term when inputted.
This is the code:
if (!(isset($_GET['pagenum']))) {
$pagenum = 1;
} else {
$pagenum = $_GET['pagenum'];
}
$page_limit = ($_GET["show"] <> "" && is_numeric($_GET["show"]) ) ? $_GET["show"] : 8;
try {
$keyword = trim($_GET["keyword"]);
if ($keyword <> "" ) {
$sql = "SELECT * FROM tbl_contacts WHERE 1 AND "
. " (first_name LIKE :keyword OR contact_no1 LIKE :keyword) ORDER BY first_name ";
$stmt = $DB->prepare($sql);
$stmt->bindValue(":keyword", $keyword."%");
} else {
$sql = "SELECT * FROM tbl_contacts WHERE 1 ORDER BY first_name ";
$stmt = $DB->prepare($sql);
}
$stmt->execute();
$total_count = count($stmt->fetchAll());
$last = ceil($total_count / $page_limit);
if ($pagenum < 1) {
num < 1) {
} elseif ($pagenum > $last) {
$pagenum = $last;
}
$lower_limit = ($pagenum - 1) * $page_limit;
$lower_limit = ($lower_limit < 0) ? 0 : $lower_limit;
$sql2 = $sql . " limit " . ($lower_limit) . " , " . ($page_limit) . " ";
$stmt = $DB->prepare($sql2);
if ($keyword <> "" ) {
$stmt->bindValue(":keyword", $keyword."%");
$stmt->execute();
$results = $stmt->fetchAll();
}
} catch (Exception $ex) {
echo $ex->getMessage();
}

Answer 1

I figured it out. Fixed by changing:
. " (first_name LIKE :keyword OR contact_no1 LIKE :keyword) ORDER BY first_name ";
to
. " (first_name LIKE '%".$keyword."%' OR contact_no1 LIKE '%".$keyword."%') ORDER BY last_name DESC ";
Now the search returns any keyword entered